![]() make it challenging when it comes to placing sconces, ceiling lights, and even light switches. Although the interpreted reactions constitute subtle modifications in the linearity of flight paths, we discuss future work that could verify whether the protection of nocturnal migrants with lights-out programs would have greater impact if implemented beyond urban areas and include management of low-rise lights. That said, effectively lighting a bathroom can be tricky. To our knowledge, this is the first study to show that low-rise lights pointing downward affect night-migrating birds. 7-304 D Flashing Lights None of the exterior lights are flashing or. Diurnal capture rates of birds were not different when lights were on or off for either season. 7-304 A Downcast Lighting All the exterior lighting fixtures on the Storage. Thus, the effects of ALAN on night-migrating land birds are not limited to bright lights pointing upward or lights on tall structures in urban areas. For example, spotlights can be aimed up at the areas between second-story windows, and downlights can be used to cast down light on decks as well as. Under poor visibility, reactions were up to 50% more likely to occur farthest from structures in spring, but up to 60% more likely to occur closest to lights in autumn. Interactions between distance to lights and visibility or cloud cover were consistent with known effects of ALAN on nocturnal migrants. In autumn, some vertical reactions were ∼40% more likely to occur at ∼50 m from the lights than at >2.2 km. Reactions in spring were up to ∼60% more likely to occur at ∼35 m from the lights than at >1.5 km. Reactions were up to 40% more likely to occur in autumn than in spring depending on the threshold magnitude of turning angle. ![]() Similar to traditional wall packs, these cut off fixtures offer a more focused downcast light as opposed to the more exposed and widespread illumination of their traditional counterparts. Flight paths with and without reactions were generally closer to our experimental site in spring than in autumn when the lights were on. These are ideal for locations looking for ample light while keeping with the pleasing decor of the exterior. We identified change points along flight paths where birds turned horizontally or vertically, and we considered these indicative of reactions. We analyzed 1501 high-resolution 3D nocturnal flight paths of free-flying migrants and diurnally captured 758-2009 birds around experimental lights during spring and autumn 2016, and spring 2017. We conducted a controlled longitudinal experiment with light-emitting diode floodlights and considered nearby structures that turn on lights at night. We predicted that birds in flight will react close to low-rise lights, and be attracted and grounded near light sources, with a stronger effect on juveniles during their autumn migration. We hypothesized that common low-rise lights pointing downward also affect the movement of nocturnal migrants. Artificial light at night (ALAN) on tall or upward-pointed lighting installations affects the flight behavior of night-migrating birds.
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